linux-kernel - Re: [PATCH -mm 7/8] ACPI hibernation: Utilize hardware signature

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Message-ID: <20080710083423.GD5629@elf.ucw.cz>
Date:	Thu, 10 Jul 2008 10:34:23 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Shaohua Li <shaohua.li@...el.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH -mm 7/8] ACPI hibernation: Utilize hardware signature


> Subject: ACPI hibernation: Utilize hardware signature
> 
> ACPI defines a hardware signature.  BIOS calculates the signature
> according to hardware configure and if hardware changes while
> hibernated, the signature will change.  In that case, S4 resume
> should fail.
> 
> Still, there may be systems on which this mechanism does not work
> correctly, so it is better to provide a workaround for them.  For
> this reason, add a new switch to the acpi_sleep= command line
> argument allowing one to disable hardware signature checking.
> 
> Signed-off-by: Shaohua Li <shaohua.li@...el.com>
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>

ACK.

-- 
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